The variegated philodendron plant contains large amounts of insoluble calcium oxalates. This substance is produced by a large number of plants in order to make them as inedible as possible for animals, thereby improving the species' survivability. The insoluble calcium oxalates are (as the name would suggest) a solidified form of calcium and oxalic acid. They solidify into extremely sharp, tiny crystals that work by digging into the soft tissues of the target animal, causing widespread irritation in a short amount of time. Thus, as soon as the scindapsus is eaten, it will start to irritate the mouth of the victim. As the plant matter is swallowed and digested, the oxalate crystals will continue to dig into tissues in the stomach and bowels, eventually provoking vomiting and diarrhea.